# Jupyter Server Proxy allows users to run arbitrary external processes alongside their notebook server and provide authenticated web access to them. Versions of 3.x prior to 3.2.4 and 4.x prior to 4... Advisory record · `GHSA-fvcq-4x64-hqxr` - **Identifiers:** `GHSA-fvcq-4x64-hqxr` · `CVE-2024-35225` · `PYSEC-2024-236` - **State:** Confirmed - **Severity:** CVSS 9.7 Critical - **Critical:** Yes: CVSS 9+ - **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) · [CWE-116](https://cwe.mitre.org/data/definitions/116.html) - **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) · [CWE-116](https://agentprime.io/advisories/tag/cwe-116.md) - **Published:** 11 Jun 2024 - **Updated:** 10 Jun 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 11 Jun 2024, 22:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Critical Critical, because: - CVSS score 9.7: 9.0 or more. How we decide what’s critical: ## Affected packages - `jupyter-server-proxy` (PyPI): affected `<7abc9dc5bbb0b4b440548a5375261b8b8192fc22 || >=3.0.0, <3.2.4 || >=4.1.2, <4.2.0`; fixed in `7abc9dc5bbb0b4b440548a5375261b8b8192fc22`, `3.2.4`, `4.2.0` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Jupyter Server Proxy versions 3.0.0 to before 3.2.4 and 4.1.2 to before 4.2.0 are vulnerable to reflected cross-site scripting. An attacker who sends a user a crafted phishing link can run arbitrary JavaScript in the user's browser when they click it, gaining extensive access to their JupyterLab instance. Upgrade to version 3.2.4 or 4.2.0; if that is not possible, disable the jupyter-server-proxy extension. Written 10 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 9.7 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.0044, the 38th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline This record came from the full history of the GitHub Advisory Database, published 11 Jun 2024. New records show when each source confirmed them. ## Sources - [GitHub Advisory Database: GHSA-fvcq-4x64-hqxr](https://github.com/advisories/GHSA-fvcq-4x64-hqxr) - [OSV: GHSA-fvcq-4x64-hqxr](https://osv.dev/vulnerability/GHSA-fvcq-4x64-hqxr) - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .